Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 711 | 641 | 713 | 703 | 741 | 718 |
| Tmin | 711 | 643 | 712 | 703 | 741 | 715 |
| Duration of sunshine | 93 | 56 | 62 | 90 | 124 | 90 |
| Precipitation | 622 | 562 | 622 | 616 | 650 | 632 |
| Humidity/Visibility | 91 | 83 | 92 | 104 | 121 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 734 | 729 | 718 | 736 | 718 | 729 |
| Tmin | 736 | 725 | 719 | 735 | 717 | 742 |
| Duration of sunshine | 62 | 124 | 90 | 93 | 120 | 31 |
| Precipitation | 652 | 654 | 630 | 648 | 632 | 654 |
| Humidity/Visibility | 116 | 110 | 118 | 117 | 117 | 121 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
